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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f70eea44c26ff7a29923898e6cdb0989a0b0428a825a13783fd9b41a72e1451' 
  AND token = '6TnpM1ohYsesy5fnpnhewOiGLN49tn959huhq8bGm+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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