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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7707094bb5547f4522bc85ea1b0c1a9be165969e6198e8076af099a56279f2' 
  AND token = '/PmJ88Wi8sBJ0ymkQoymQHg3vZ3YBZXO58RW1n/DGqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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