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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968c5443ac147149d2fd64cc3f81e2cee7995902170106c9b1e9f36eceffff2c' 
  AND token = '3Z9vQeQ3moa+nM6orNPfBJ+VaqXK+Kastoc48RhnTRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}