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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5690b7dbb2e5b133d3e6ab4aa9f747120a963369922efb063413877d4ea60fe' 
  AND token = 'nE+X3L6+t+kd74SyoVAOpORE4oZBssEDWDOUepT+Qv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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