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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde31df4ae78d1399a7c22b05e3a9a59d92c6042e0109ce0fdb148395008798c' 
  AND token = 'dggW2BkR/VUywgYcExnTuVpnFt+pK074q+8/f/1ybqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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