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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936a3a1d3cf196555d1ad05ef4f10c758c92af41ff4b6970d69a6830ceb5a998' 
  AND token = 'uFSklian3OSMD47qD2Z1HyyJ9CPgAK7dbMJLcpl/rFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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