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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cb49b969f9b5cf2545d25bba473a65593e9eb455536690a735558bc80f495c' 
  AND token = 'BrU4YJgnRO5v6r1Rlpb+Sb7CYtV3gm1cUtE+GkuylkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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