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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69aa4e4c76fda5324e47daf757dba950a16d254f7da37c43f39cf391eb2224c0' 
  AND token = 'W/D9j1d5sunj/WW/TRTzjLNGmO+AKN4fhZNdMDdmVH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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