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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f2a979af6b655d60f7ab1e3a6e6148048f78f22191620ab02932edc30cd228' 
  AND token = 'zLMgEPa3KF0hB53F+R0gn3AmKDiZ1aV7hQaoK88iXfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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