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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab4fb1931d080b7c30fca39d5bf09b13387a0f6abd206ca745d25644c3ac288' 
  AND token = 'pI1GkVAszp+Umu3obrtDKlZJ9FUFS66Ewy3Pieva0/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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