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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c87452c4c8e4f319ece322baa30ba34a03c9a0a47b6286cf728659e9a0b7d7' 
  AND token = 'pHzcuXP4Fm6imp0D0sOOPxC9EUYIc+QZ1qdU2ZlznkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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