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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d43234d5955e2ae9fabb00518b969af2548655ae4d45982d2775041a19d910f' 
  AND token = 'r7Mrl5ng/nRILqBkIiFwh+K1TrX35MF+ttb8fKnBFSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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