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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea134f0c21a3765097a609ee3024af734fb0572a0cf5e784384c8ef4d3258aeb' 
  AND token = 'c/Pg7d8RApyOZ3ibnkynaq6ShR8pqQWqfSEHSejqNPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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