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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba6c1f676bfbbdb936308c3a3e03cd4c140614f1dc420d07e45501bbabf7a8a' 
  AND token = 'vCQ5QDeicCKQ/iPb3z73dZ7Ko/Y5O7gfPdpdXNeRZls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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