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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ba59080432d89ecfcb990a64abf6107d54f161f91b991fee834e36cc87b52f' 
  AND token = 'PbbWNVOd8+ruiwT98+6ZDvsoLJvBzAv4qfbI5c8m2n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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