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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e428debf0d9149956e28a7022da71cf1c0e44ec9c6ab15d4de5925ccf782fd' 
  AND token = 'UVkR9sKmRwhnbwCWins3pVcJv/91m3c75/ulWlLPCDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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