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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fb991a64b0c5528548d4d43c395fbe9cef25122c8d964dca000d9acdda078f' 
  AND token = 'ey/3TPARckmA4hJrbra3+sQINIID4deNzTfyYkGNhyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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