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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90873784efa733ed8a8ee4407e5578cff424cba53b3c90c52c6fdaf310dc5c09' 
  AND token = 'bKGdV/LBf0iIBJWd30hrFPKs57tKBfTwiXTORMs7rpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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