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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a0da85aa9d70ec34b5dfa320913d0497f116498a04978520febc1a052f05e8' 
  AND token = 'LIQRtvzVQGrjLIdubS7jb0H6Uq3LjysyC87OcLLT6Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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