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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a455da86244ae867a5d864bab9bbb19a93ec46e9855685503e46b4aca7401b5' 
  AND token = 'FsWY4+4XsJsfc60U/BSIRqaatX2qeXUnJbo+03IK/eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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