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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a389d9db69909a6af5d2e831e9e82185fe106e9ebacfe374f208d594d0bfbec' 
  AND token = 'DktLVoAU2+2aPG2QW0OUM7Uz1O12Ldw5ew+GCoF1Cak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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