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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8455602ab376ab5c5515a2f08ad9f5158b9b978e5aa6e7d3ed3301e45555f90' 
  AND token = 'hv97TfqbNJBJvtU8YznkdskfTncDAAYz62616u4DsNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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