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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523c92aa66c32a5593f66e377b2e265499c22a0e215ddac0a8cfd36af2ece1bc' 
  AND token = 'GJXC7y93VcK094dCxC8NxO9PUCpKAeDm+JXYIWiPLjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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