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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b183db554b1e196cfe577469e436ff17fa27df6dac6bb4d27e4d4ef47425e2d' 
  AND token = 'jk9P4pyYkRWropH807CvACNSnRhpjPLk6PGoxxwzISY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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