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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77017772ce2db12c3cd9fd4ba4426d91dde1efe5ada9eba5c4707947b55f2895' 
  AND token = '5XfSTFTPLyp4GvBbrCSZe1GoRflN3IjZXw8x+U/hs98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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