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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25a84392cac0b272f42a453bbe923132ee3f9d127736bbef93821263875b6e3' 
  AND token = 'zYyox1qArPc0lH8i+x+bttn6ZH0OV8zJrMjhw285Og8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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