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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ab098d0fee6d6c82452a586bc0e43e6f56def5904f33ee64b2f676f4afd8ae' 
  AND token = 'F0lP4y8asLA8UZzLQEHI+rTCMVJih2ocMYZeXKNeQlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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