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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c382070c1121bf1ab49c8ca9706a7806594785a0a4ad07c9f6a0a608dca54136' 
  AND token = 'br7EEuhFnFaL0+CRjCSQZR5SDUWDiBwX0u50t4X1oe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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