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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2fc047b6a1bb8eeb07897b41733e6cd8732dab1a75311c0e812240e495f1a8' 
  AND token = 'J2r1PoW+sZ/iIymoi5JoNwVVgPTT7c8MMx3Q9CHRS/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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