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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da520559bf4ebbe23953a906dd11c6e81d60b81e2424f07e5b32345d5afb090' 
  AND token = 'Y3ChPAUW2CkqbPBRpCSKqiUKOw2Ddnw1iiBf0sRwgkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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