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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffe6e7d26824751cbd162a4d2c1e074398628b1e083fa4e0e3d0595ded0237e' 
  AND token = 'oLmRNti357Gtu3WR2N7Z82Z2hJoGKk+UhbbU8UcTrgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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