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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4139606dad1dabe7a3b830db58d4351fee40ab396bfc2c42760a47daaeea7942' 
  AND token = 'WQX4LOSYcWjJeHyNezvA81xzdJWvuiYP/h9o4QD9BkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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