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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a6a63cb480e2c75005732494db6f4077945d9bb417b18ea072a909ea267dc5' 
  AND token = 'aawfWQYJvfdhYhLLxh4eXj99wu1UxSHVGavrPJEChxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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