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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c36b58011070b27c606ada377811d0f64b4c6d06547700e2bc9c3083fc046a' 
  AND token = 'W8E1hgawi4ndzw3rVUlqoYJvVO/D06VDNs+dB2MOWGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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