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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24973edeaa5b465e1db405ccdafbebcc31855b32d2f5028729a5f97aeae8a8e' 
  AND token = 'P8kFAxEDCJEWEy7mPIBRH86LRVQEItONPCvf2wiyoDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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