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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4dc5c0d7ee93f3402d1d47e1104b604e9d579e92dc6d5027ee7bca280054e4' 
  AND token = 'Kj56i1vL5RB1ca7mG1bry4eKEsuvt/eai5OTJ3TGomY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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