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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e92155bd89e84ca7ff99277bd96d1ef877d678b5e6b84c2ccb2c467ec01d95' 
  AND token = 'X+XPaOvjzd+/UYkOQUfbKrc0ZLdcakIU2C+giz+Todo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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