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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d703abcf9a3ed026031f29b517ef3a536a4d61da710fd1bdac14f2370fc1f00' 
  AND token = 'o82lkFx0rXAcubvbRdEOvBsmTnVJilVzwY+cXMOmFC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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