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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e9ff4fc1ead798d9a00e786d3e0ef996f7a416dcacdd2f8f3fb215621ffe78' 
  AND token = 'aWKOnzAK4ug+oDkXmuI6Mi+Wx+z6yVI9i3LPCQ3T+tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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