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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2e3b9e4677ad94330bfd6a3e0450d465524bbeda1f8604d9720dd597bcd2ef' 
  AND token = 'uL5djw3H9KOUi1jK+vXtiqL3NZ2oBq2j/EcvSckLlNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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