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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde2e628b871d1a23cf6e4d7fbf98a0735b56b3ffd01ad7eb557be68af47b6fe' 
  AND token = '+w6S/XMn+zsUrTZyHTzLSmavrg6kLlPrLh0vilK92gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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