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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dc1835e0343fde033f12191e04cf0974bed8f684ed91ad814c41379ba62599' 
  AND token = 'DiBYxPeidywaOmDff6NTYuvC2X6c/DMgdc7FXBazOro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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