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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dee69f1c61f49a3a6f092b2fff4447f15297ec13df28dd7ced26e596f8c1c39' 
  AND token = 'QHEz53YdEruFhInX2c3I+IJL8vKPTby4BiIypmaI4To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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