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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f380f54d841a1af8df7856faa4edfea7be8572d2a278dacd87ae2ed5264a198' 
  AND token = 'Z0vZ2FGvzx72bm+8YBGSRgJ6PxhToBGLIb+60FkwL1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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